扇形

The concept of the reverse gcometry CT has been borrowed and extended. The fully reconstruction conditions and the relevant reconstruction algorithm in view of parallel and fan beam projection are given too.

3提出了倒置结构断层CT的概念，并就平行束和扇形束两种情形，给出了倒置结构断层CT的完全性条件、成象结构的各参数之间必须满足的条件及重建算法。

Male peafowl; having a crested head and very large fanlike tail marked with iridescent eyes or spots.

雄性孔雀；有头冠和大的扇形尾巴，尾巴上有彩虹般的眼状花斑。

A male peafowl, distinguished by its crested head, brilliant blue or green plumage, and long modified back feathers that are marked with iridescent eyelike spots and that can be spread in a fanlike form.

雄孔雀：雄性孔雀，具有头冠，明丽的蓝色或绿色羽毛，长长的装饰性后羽，带有眼状的彩虹般的花斑，可展成扇形

Peacock A male peafowl, distinguished by its crested head, brilliant blue or green plumage, and long modified back feathers that are marked with iridescent eyelike spots and that can be spread in a fanlike form.

雄孔雀：雄性孔雀，具有头冠，明丽的蓝色或绿色羽毛，长长的装饰性后羽，带有眼状的彩虹般的花斑，可展成扇形

A male peafowl,distinguished by its crest ed head,brilliant blue or green plumage,and long modified back feathers that are marked with iridescent eyelike spots and that can be spread in a fanlike form.

雄孔雀雄性孔雀，具有头冠，明丽的蓝色或绿色羽毛，长长的装饰性后羽，带有眼状的彩虹般的花斑，可展成扇形

This thesis establishes constrained motion model and sensor model of a mobile robot to represent mobility and perceptivity, respectively, and defines the k step reachable region to describe the states that the robot may reach. We show that the calculation of the k step reachable region can be reduced from that of 2k reachable regions with the fixed motion styles to k + 1 such regions, and provide an algorithm for its calculation.

首先建立了移动机器人约束运动模型和传感器模型用于描述机器人的移动和感知，给出了可达区定义，即机器人在有限步内可能到达的区域，在此基础上证明了在k步不同运动模式下多达2k个可达区的计算可以降为k+1个可达区的计算，并提出了k步可达区由k+1个扇形组成的计算算法。

There they spread out like foragers on a picket line, each alone or in small groups probing a carefully chosen, narrow sector.

在那里他们如同远征队员那样按警戒线散开，独自或者三两成组的搜索他们面前经过仔细选择的狭窄的扇形区域。

Much attention is paid to the mesh principle of variable ratio rack and sector, which includes the principle of variable ratio, the selection of gear type, the setting up of rolling pitch line, and the determination of tooth profile.

重点说明转向器中变速比扇形齿轮和齿条的啮合原理，包括变速原理，变速齿轮的选择，滚动节线的建立，齿形的确定等问题。

Certainly some of the same demanding titles are in the list, but it's populated more by simpler "platformer" and parlour games, which both attract their own significant fan-bases.

当然一些相同的要求职称都在名单上，但它的人口多，由简单的" platformer "和桑拿，游戏，它都能够吸引他们自己的显着扇形基地。

Another AAF radar set merits mention. This is the AN/APS-15, a 10,000 MHz precision bombing set with sector scan and PPI display.

另一种值得提及雷达的是AN/APS-15，工作在1000MHz，可以进行扇形扫描和PPI显示的精确轰炸雷达。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。